{"id":"CVE-2026-85526","title":"Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a …","summary":"Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a …","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-22"],"vendor":"Canonical","product":"LXD","affected":["LXD >= 4.0.0 < 4.0.14","LXD >= 5.0.0 < 5.0.10","LXD >= 5.21.0 < 5.21.8","LXD >= 6.0 < 6.10"],"published":"2026-09-28","updated":"2026-09-28","sourceUpdated":"2026-09-28T15:12:32.657","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85526","references":[{"url":"https://github.com/canonical/lxd-private/pull/103","label":"security@ubuntu.com"},{"url":"https://github.com/canonical/lxd-private/pull/104","label":"security@ubuntu.com"},{"url":"https://github.com/canonical/lxd-private/pull/105","label":"security@ubuntu.com"},{"url":"https://github.com/canonical/lxd-private/pull/84","label":"security@ubuntu.com"},{"url":"https://github.com/canonical/lxd-private/pull/87","label":"security@ubuntu.com"},{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv","label":"security@ubuntu.com"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-28T13:53:32.983935Z"},"ingestedAt":"2026-09-28T14:12:02.163Z","slug":"CVE-2026-85526","body":"## Overview\n\nPath traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":54.5,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}